More than 10 intelligence and police officials in five European countries including Britain, Germany and France told Reuters they are increasing surveillance of Islamist militants. A British security official said the war in Gaza was likely to become the biggest recruiter for Islamist militants since the Iraq war in 2003, and that calls for attacks on Jewish and Western targets had risen in Europe. Two Islamist militant attacks in France and Belgium last month killed three people, and these two countries, Austria, Slovenia and Bosnia-Herzegovina have raised their terrorism threat alert levels. LONE WOLVESSecurity officials say the main danger for Europe is probably from attacks by "lone wolves" — assailants who are radicalised, often online, but have no formal links to more established groups. Although a truce has come into effect in Gaza, both sides have said the war is far from over.

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Persons: Gonzalo Fuentes, radicalised, Mark Rowley, al, Jochen Kopelke, It's, Kopelke, Israel, Peter Knoope, Knoope, Iman Atta, Germany's Kopelke, influencers, Europol, Thomas Renard, Juliette Jabkhiro, Angelo Amante, Johan Ahlander, Phil Blenkinsop, Timothy Organizations: REUTERS, Reuters, London, British, Islamic State, Islamic, WOLVES Security, Hamas, Dutch National, International Centre for, Timothy Heritage, Thomson Locations: Paris, France, BERLIN, Israel, Britain, Germany, Russia, China, Iran, Gaza, Iraq, Europe, Belgium, Austria, Slovenia, Bosnia, Herzegovina, Italy, al Qaeda, Islamic State, Qaeda, Afghanistan, Syria, United States, British, al, West